Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 405 AM EDT Tue May 05 2020 Valid 12Z Tue May 05 2020 - 12Z Thu May 07 2020 ...A low pressure system will keep a good chance of rain across the eastern U.S. during the next couple days... ...A Pacific front will bring a quick round of precipitation in the Northwest and the northern Rockies followed by much cooler conditions... ...Much above average temperatures continue across much of the West as much below average temperatures spread further into the eastern U.S.... A developing low pressure system over the Mid-Mississippi Valley will move relatively quickly toward the Mid-Atlantic coast by Wednesday morning as it slowly intensifies. This will keep a good chance of rain for the central Appalachians into the Mid-Atlantic states through much of Wednesday. Areas in western Pennsylvania could even see some wet snow Wednesday morning as colder air settles into much of the Northeast on the back side of the storm. The storm should continue to intensify off the New England coast Thursday morning with rain most likely moving across southeastern New England. Thunderstorms will be likely across the Deep South, the Southeast, and into the Carolinas through Tuesday night ahead of a cold front. Clearing skies and much cooler temperatures will follow on Wednesday, spreading further south into Florida by Thursday behind the cold front. Over the Pacific Northwest, a quick round of moderately heavy precipitation will move across the region early Wednesday as a cold front pushes quickly inland. Some high-elevation wintry precipitation will move into the northern Rockies late Wednesday into early on Thursday as a new low pressure system begins to develop over the High Plains. Much cooler air will then settle across much of the northwestern U.S. behind the Pacific cold front. On the other side of the front, chance of thunderstorms will be on the increase early Thursday ahead of the developing system over the central Plains. Meanwhile, above average temperatures will continue from southern California into the Desert Southwest and the Great Basin. High temperatures across these regions are expected to be 10 to 15 degrees above average. In contrast, much below average temperatures will persist across the northeastern quarter of the nation from the Upper Mississippi Valley, Great Lakes, Ohio Valley and Mid Atlantic. Across these areas high temperatures are expected to be 10-15 degrees below average. Portions of the Upper Ohio Valley, central Appalachians and Mid-Atlantic may see record low maximum temperatures today and Wednesday. Kong/Oravec Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php